Can closure



June 14, 1932. L. HIRSCH ET AL CAN CLOSURE Filed Feb. 4, 1930 INV TO 5 ATTORNEYS Patented June 14-, 1932 UNETED STATS PATENT OFFICE LEONARD HIRSOH, OF LYNDHURST, AND EDWIN A. HARE-1S5, 0F ORANGE, NEW JER- SEY, ASSIGNOR'S To B. B. DAVIS COMPANY, OF HOBOKEN, NEW JERSEY, A CORPORA- TION OF NEW JERSEY CAN CLOSURE Application filed February 4, 1930. Serial No. 425,748.

This invention relates to a novel and improved form of metal closure for cans, and will be best understood from the following description and the annexed drawing, in which we have shown a selected embodiment of the invention and in which Fig. 1 is a View partly in elevation and partly in section showing the top of a can having the closure applied thereto.

Fig. 2 is a section on the same plane as the sectional part of Fig. 1, showing a portion of the closure on an enlarged scale, before attachment to the can.

Figs. 3, 4, 5, 6, 7, 8 and 9 are views illustrating successive steps performed on a blank to form the closure.

In Fig. 1, we have shown the invention as applied to a can 1 having a top 2 secured thereto as by a seam 3 of any suitable construction. The top is provided with a recess 4 here shown as cylindrical in form and adapted to receive a plug 5. The cylindrical wall is shown as extending in a vertical direction, and in the claims it will be referred to as vertically extending, this being done for the sake of convenience in defining relative parts of the structure, and not for the purpose of limiting the invention. The bottom of the re cess 4 is closed by a sealing member 6, preferably of relatively frangible material, as compared with the relatively non-frangible material of the top, the top being preferably formed of sheet metal. This invention relates to the means for fastening this sealing member to the top.

Referring now to Figs. 2 to 9, inclusive, Fig. 3 shows a form of blank from which the top may be made. This blank may comprise a bottom 7 surrounded by a cylindrical wall 8. By the use of suitable dies, the blank is brought to the form shown in Fig. 5, and then the bottom 7 is removed, as shown in Fig. 6, and the edge portion of the wall 8 is bent outwardly to form a circumferential flange 9, as shown in Fig. 7

The next step is to place over the bottom of the recess the sealing member 6, as shown in Fig. 8. This sealing member has the central portion thereof depressed, as plainly shown, and this depressed central portion is surrounded by a ciroumferentialflange 10 engaging the inner face of the wall 8. The edge portion 11 of the sealing member forming an extension of the flange 10, is also bent outwardly to the position shown in Fig. 8, before the sealing member is placed in the position shown in that figure. Although the effect of this configuration is to provide a flange with an outwardly bent portion, nevertheless it is to be understood that, in practice, this configuration of the sealing member may be advantageously obtained by forming it from a flat sheet by the use of suitable dies.

The next step is to lock the extreme edge of the portion 11 with the edge of the flange 9, and this is preferably done by rolling the flange 9 and the portion 11 so that the portion 11 will be folded back over the extreme edge of the flange 9, as plainly shown in Figs. 1 and 9, and to better advantage in Fig. 2. This may be done by suitable spinning tools, the depressed central portion of the sealing member making it possible for one of said tools ,to engage the flange 10 and thus act against another spinning tool on the outside of the wall 8. The result is a one-piece can top having an opening therein closed by a sealing member secured to the top adjacent the opening by a permanent mechanical airtight joint. This combination is claimed more broadly in our copending application, Serial No. 351,068, showing a specifically different form of joint.

WVhen the contents of the can are to be 7 used, the frangible sealing member may be easily cut out so as to give access to the can which may be temporarily closed by means of the plug 5. No exposed rough edge will be presented after this cutting.

We claim 1. A can closure having a recess surrounded by a vertically extending wall of sheet material, the lower edge of said wall being turned outwardly and upwardly to constitute a wall edge portion outside the main portion of the wall, and a sealing member extending across said recess and having an edge portion extending over said wall edge portion and between said wall edge portion and the main portion of the Wall and in close contact with both of them.

2. A can closure having a recess surrounded by a Vertically extending wall of sheet material, the lower edge of said well being turned outwardly and upwardly to constitute a wall edge portion outside the main portion of the wall, and a sealing member disposed within and extending across said recess, sai-d sealing downwardly disposed flange engaging the inner surface of said Wall, said flange extending outwardly, upwardly and downwardly over said wall edge portion and between said wall edge portion and the main portion of the wall and in close cont-act with both of them.

LEONARD HIRSCH. EDWIN A. HARRISS.

member having a 

